Latitude 7420/Latitude 7420 2-in-1 Service Manual

1. Shut down the system and disconnect the AC adapter.
2. Press and hold the <B> key on the keyboard and then press the power button. The system boots.

   

3. [For models configured with an Owner Tag] When the Owner Tag information appears on the screen, press any key to proceed.
   NOTE:The Service Mode procedure will automatically skip this step if the Owner Tag of the system is not set up in advance by the manufacturer.

   

4. Ensure that the AC adapter has been disconnected and press any key to proceed.

   

5. When the ready-to-proceed message appears on the screen, press any key to proceed. The system emits three short beeps and shuts down immediately.

   

Once the system shuts down, you can perform replacement procedures without disconnecting the battery cable from the system board.

To exit Service Mode, connect AC adapter and press the power button to power on the system. The system will automatically return to normal functioning mode.